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plural sousaphones
A valved brass instrument with the same length as a tuba, but shaped differently so that the bell is above the head, that the valves are situated directly in front of the musical instruments and a few inches above the waist, and that most of the weight rests on one shoulder. quotations examples
One version of the large tuba, popular in marching bands, is called a sousaphone in honor of bandsman John Philip Sousa.
1990, Thomas D. Rossing, The Science of Sound, page 230